Sea-swept blue, as deep as the whirlpool that swallowed ships whole.
Charybdis is a bright blue.
It can be described as bright, vivid, brilliant and glowing.
Set in black, because black reads best on it.
Charybdis is a sea monster in Greek mythology. Along with the sea monster Scylla, she appears as a challenge to epic characters such as Odysseus, Jason, and Aeneas. The descriptions of Greek mythical chroniclers and Greek historians locate her in the Strait of Messina.
Read on WikipediaCharybdis is a genus of swimming crabs in the family Portunidae. It is named after the monster Charybdis of Greek mythology.
Read on WikipediaProper noun